婷婷中文字幕在线,精品视频国产一区,91超碰在线免费观看,国产女人和拘做受视频免费,国产中文字幕剧情,www.免费视频视频,一区二区在线免费

How to distinguish indoor optical cable from color?

release:admin Browse:4635 times

Yellow represents single-mode optical cable; Orange represents multimode optical cable; Some manufacturers use blue to represent multi - mode million optical cable.